• cover someone's back
• have got someone's back
• get someone's back

• IPA^(key):/hæv ˌsʌmwʌnz ˈbæk/

• Audio(General Australian):

  (file)

havesomeone'sback (third-person singular simple presenthas someone's back,present participlehaving someone's back,simple past and past participlehad someone's back)

1. (idiomatic) To be prepared and willing tosupport ordefend someone.

   If you ever need help, just ask. You know Ihave your back.

   • 2022 October 5, Rowena Mason, quoting Liz Truss, “Liz Truss promises ‘growth, growth and growth’ in protest-hit speech”, inThe Guardian‎^[1]:

     Liz Truss has promised Britons shehas “got your back” and set out a plan for “growth, growth and growth” in a conference speech disrupted by protesters asking who voted for her plan.

• have got someone's six(chiefly military and law enforcement slang)